Chris Munn
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Undertow is a flexible performant web server written in java, providing both blocking and non-blocking API’s based on NIO. Undertow has a composition based architecture that allows you to build a web server by combining small single purpose handlers.
There are two ways to bootstrap Undertow. The first and most simple is to use the io.undertow.Undertow builder API. The second is to assemble a server using XNIO and the Undertow listener classes directly. This second approach requires more code, but gives more flexibility.
Undertow is the default web server in Wildfly, so usage is as simple as deploying a war.
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The Java network programming world has come a long way since Undertow was first started. Netty has emerged as the de-facto standard for network programming in Java, and the Undertow team has decided that the benefits of utilizing Netty outweigh any benefits in keeping our XNIO based transport layer.
Apr 15, 2019 · Undertow 3.0 will keep Undertow’s programming model, however the underlying transport will be changed from XNIO to Netty. We will also use the Netty HTTP/1, HTTP/2 and Websocket implementations. We believe this change will have a number of advantages:
Apr 27, 2020 · Instead this guide focuses on the concepts you will need to write an Undertow handler. Lets start with a simple example: import io.undertow.Undertow; import io.undertow.server.HttpHandler; import io.undertow.server.HttpServerExchange; import io.undertow.util.Headers; public class HelloWorldServer {.
This document covers the lifecycle of a web request from the point of view of the Undertow server. When a connection is established XNIO invokes the io.undertow.server.HttpOpenListener , this listener creates a new io.undertow.server.HttpServerConnection to hold state associated with this connection, and then invokes io.undertow.server ...
Listeners. Listeners represent the entry point of an Undertow application. All incoming requests will come through a listener, and a listener is responsible for translating a request into an instance of the HttpServerExchange object, and then turning the result into a response that can be sent back to the client.
Undertow is open source and developed on Github. Contributions are always welcome.
